Engine › POWER TUNE XTO TUNING INSERTS 2.25" Image 1 of 1 POWER TUNE XTO TUNING INSERTS 2.25" $22.95 Sold Out Tuning inserts allow for sound & power adjustment.Easy Installation304 Stainless constructionMade in USA! Sold Out Added! Tuning inserts allow for sound & power adjustment.Easy Installation304 Stainless constructionMade in USA!